PLA TE XX. 



EXPLANATION. 

 Fig. 



1. Paramonas GLOBOSA, From, sp., vol. i, p. 370, x 400 (Fromentel). 



2. Paramonas stellata, From, sp., vol. i. p. 370, x 400 (Fromentel). 



3. Petalomonas mediocanellata, St., vol. i. p. 371, X 350 (Stein). 



4. Petalomonas sinuata, St., vol. i. p. 372, x 400 (Stein). 



5,6. Petalomonas abscissa, Duj. sp., vol. i. p. 371, dorsal and ventral views, 

 X 500 (Stein). 



7. Petalomonas ervilia, St., vol. i. p. 372, x 400 (Stein). 



8,9. Petalomonas irregularis, S. K., vol. i. p. 372, x 1250. 



10-12. Atractonema teres, St., vol. i. p. 373. — II, Animalcule dividing by longi- 

 tudinal fission; 12, example without flagellum, and with the endoplast 

 enlarged and broken up into germinal elements, x 640. 



13, 14. Phialonema cyclostomum, St., vol. i. p. 373, X 500. — 14, Variety with spirally 

 ribbed cuticle (Stein). 



15, 16. Menoidium pellucidum, Pty., vol. i. p. 374. — 15, As observed by the author; 

 16, after Stein, x 600. 



17-21. Astasl\ trichophora, Ehr. sp., vol. i. p. 376. — 17, Typical adult zooid, after 

 Biitschli, X 600 ; 18, example with internal germ-like bodies, after Carter; 

 19-21, various polymorphic forms. 



22. COLPODELLA PUGNAX, Cienk., vol. i. p. 378. — Three animalcules parasitically 



attached to a cell of Protococcus, x 500 (Cienkowski). 



23. Spiromonas distorta, Duj. sp., vol. i. p. 298, x 600 (Dujardin). 

 24-25. EuGLENA ACUS, Ehr., vol. i. p. 383. — 25 and 26, after Stein, x 300. 



26. EUGLENA OXYURIS, Schm., vol. i. p. 383, X 200 (Stein). 



27, 28. EuGLENA SPIROGYRA, Ehr., vol. i. p. 382. — 27, Normal extended animalcule, as 

 observed by the author, at a a, amylaceous corpuscles, x 240 ; 28, con- 

 tracted phase (Stein). 



29-51. EUGLENA VIRIDIS, Ehr.. vol. i. p. 381. — 29, Animalcule with a bulbous distal 

 termination to the flagella, after W. H. Robson ; 30-33, polymorphic con- 

 tours assumed at will by the same animalcule, x 200; 34, typical form, 

 X 600; 35, anterior extremity, with of, funicular oral fossa, c v, contractile 

 vesicle, and e, eye-like pigment-spot ; 36, animalcule with large ovate inter- 

 nally developed germs ; 37, an example with enclosed irregularly shaped 

 amoebiform germinal bodies ; 38 and 39, transparent varieties {E. hyalina, 



